osd-contiki/cpu/avr/watchdog.c
2011-03-13 13:45:12 -04:00

105 lines
3.2 KiB
C

/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/* Watchdog routines for the AVR */
/* Default timeout of 2 seconds is available on most MCUs */
#ifndef WATCHDOG_CONF_TIMEOUT
#define WATCHDOG_CONF_TIMEOUT WDTO_2S
//#define WATCHDOG_CONF_TIMEOUT WDTO_4S
#endif
/* While balancing start and stop calls is a good idea, an imbalance will cause
* resets that can take a lot of time to track down.
* Some low power protocols may do this.
* The default is no balance; define WATCHDOG_CONF_BALANCE 1 to override.
*/
#ifndef WATCHDOG_CONF_BALANCE
#define WATCHDOG_CONF_BALANCE 0
#endif
#include "dev/watchdog.h"
#include <avr/wdt.h>
#include <avr/interrupt.h>
#if WATCHDOG_CONF_BALANCE
static int stopped = 0;
#endif
/*---------------------------------------------------------------------------*/
void
watchdog_init(void)
{
MCUSR&=~(1<<WDRF);
#if WATCHDOG_CONF_BALANCE
stopped = 0;
#endif
watchdog_stop();
}
/*---------------------------------------------------------------------------*/
void
watchdog_start(void)
{
#if WATCHDOG_CONF_BALANCE
stopped--;
if(!stopped)
#endif
wdt_enable(WATCHDOG_CONF_TIMEOUT);
}
/*---------------------------------------------------------------------------*/
void
watchdog_periodic(void)
{
#if WATCHDOG_CONF_BALANCE
if(!stopped)
#endif
wdt_reset();
}
/*---------------------------------------------------------------------------*/
void
watchdog_stop(void)
{
#if WATCHDOG_CONF_BALANCE
stopped++;
#endif
wdt_disable();
}
/*---------------------------------------------------------------------------*/
void
watchdog_reboot(void)
{
cli();
wdt_enable(WDTO_15MS); //wd on,250ms
while(1); //loop
}
/*---------------------------------------------------------------------------*/